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Nexperia USA Inc. BZX8450-B4V7-QR
- Part No.:
- BZX8450-B4V7-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B4V7-QR.pdf
- Description:
- DIODE ZENER 4.7V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,094
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Product details
Overview
BZX8450-B4V7-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, rated for 4.7 V nominal regulation at 50 µA test current, with ±2 % tolerance, 250 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX8450-B4V7-QR datasheet, BZX8450-B4V7-QR pinout, BZX8450-B4V7-QR application, or BZX8450-B4V7-QR equivalent, this part serves as a precision low-bias voltage reference in battery-powered sensor interfaces, ECU voltage monitoring rails, and automotive infotainment power sequencing circuits.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 4.61 V to 4.79 V at IZ = 50 µA, exhibiting a temperature coefficient of −2.7 mV/K and differential resistance of ≤80 Ω at IZ = 5 mA. Its low leakage current (≤3.0 µA at VR = 3.0 V) supports stable biasing in ultra-low-power systems.
Designed for surface-mount assembly on FR4 PCBs with single-sided copper, it features thermal resistance Rth(j-a) = 500 K/W and Rth(j-sp) = 330 K/W, enabling reliable operation up to 150 °C junction temperature under defined mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.7 V at IZ = 50 µA - defines precise regulation point for low-current reference applications |
| Voltage Tolerance | ±2 % - ensures tight output stability across production lots without post-assembly trimming |
| Max Power Dissipation | 250 mW at Tamb ≤ 25 °C - limits thermal rise in compact SOT23 footprint on standard PCB |
| Differential Resistance | ≤80 Ω at IZ = 5 mA - maintains low dynamic impedance for stable regulation under small load variations |
| Reverse Leakage Current | ≤3.0 µA at VR = 3.0 V - minimizes quiescent current draw in battery-critical systems |
| Temperature Coefficient | −2.7 mV/K - enables predictable voltage drift compensation in automotive ambient ranges |
| Junction Temperature Limit | 150 °C - supports continuous operation in under-hood automotive environments |
Pinout & Package
Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), qualified per AEC-Q101 for automotive reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node during Zener operation |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress |
| 3 | Cathode (K) | Reverse-biased terminal; connects to regulated voltage rail and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables regulation in microamp-level bias networks for portable and sensor nodes |
| AEC-Q101 qualification | Qualified for automotive applications - guarantees reliability under temperature cycling, humidity, and vibration stress |
| Optimized leakage profile | Intentional minor leakage rise in B-series - improves switching speed and reduces noise in transient-sensitive circuits |
| Tight voltage tolerance | ±2 % tolerance band - eliminates need for external trimming in cost-sensitive automotive modules |
Applications
| Automotive ECU Voltage Monitoring | Portable Sensor Bias Reference |
|---|---|
|
Use Scenario: Monitoring 5 V supply rail integrity in engine control units using discrete comparator-based undervoltage detection. IC Role / Device Role / Timing Role: Zener reference providing stable threshold voltage for comparator input, independent of load current variation. Use Value: Enables accurate trip-point detection within ±2 % over −40 °C to +125 °C ambient, meeting ISO 16750-2 requirements. |
Use Scenario: Providing bias voltage to MEMS pressure sensor analog front-end in tire pressure monitoring systems (TPMS). IC Role / Device Role / Timing Role: Low-leakage voltage reference establishing sensor excitation level with minimal battery drain. Use Value: Draws ≤3 µA at 3 V reverse bias, extending coin-cell lifetime beyond 10 years in standby mode. |
| Infotainment Power Sequencing | Industrial PLC Input Protection |
|
Use Scenario: Generating clean 4.7 V enable signal for USB PHY power-up sequence in head unit mainboard. IC Role / Device Role / Timing Role: Regulator diode clamping and stabilizing enable line against ripple and transients during hot-plug events. Use Value: Maintains <10 mV regulation error under 100 µA load step, ensuring deterministic USB enumeration timing. |
Use Scenario: Protecting 24 V digital input channel from overvoltage surges while providing stable logic-level reference. IC Role / Device Role / Timing Role: Shunt regulator limiting input voltage to safe MCU GPIO range during transient events. Use Value: Clamps to 4.7 V with ≤80 Ω dynamic impedance, preventing latch-up in industrial-grade microcontrollers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V7-Q | ±5 % tolerance, higher leakage (≤5.0 µA at VR = 3.0 V), same SOT23 package | Acceptable where tighter regulation not required; lower cost for non-critical biasing | Select when budget constraints outweigh precision needs and leakage margin allows. |
| MMSZ4704T1G | ±5 % tolerance, 500 mW Ptot, higher rdiff (≤100 Ω), same 4.7 V nominal | Suitable for higher-power regulation but lacks AEC-Q101 qualification | Choose only for non-automotive industrial use requiring higher surge handling. |
Compared with BZX8450-B4V7-QR, the BZX84-C4V7-Q trades precision for cost in non-safety-critical roles, while MMSZ4704T1G offers higher power rating but no automotive qualification-making the BZX8450-B4V7-QR optimal for AEC-compliant, low-leakage, tightly regulated applications.
Availability
BZX8450-B4V7-QR is available at Aetrix Electronics and suitable for automotive ECU monitoring, portable sensor biasing, and infotainment power sequencing requiring stable component supply across extended temperature ranges and long lifecycle commitments.
Supply support for BZX8450-B4V7-QR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener regulator portfolio, engineered specifically for low-current, high-stability voltage reference in automotive and portable electronics where precision, low leakage, and thermal robustness are critical.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX8450-B4V7-QR has a nominal Zener voltage of 4.7 V, with guaranteed breakdown occurring between 4.61 V and 4.79 V at IZ = 50 µA. Its absolute maximum reverse voltage is not defined independently-it is characterized by its Zener knee behavior, and operation above 4.79 V at rated current will increase power dissipation beyond safe limits unless current is strictly limited.
Is this device suitable for use in a 12 V automotive system?
Yes-BZX8450-B4V7-QR is AEC-Q101 qualified and rated for operation from −55 °C to +150 °C junction temperature. In a 12 V system, it functions as a shunt reference or clamp when paired with an appropriate series resistor, and its low leakage (≤3.0 µA at 3.0 V) prevents excessive standby current draw in always-on vehicle networks.
How does the "B" suffix differ from "C" in the BZX8450-Q series?
The "B" suffix denotes ±2 % voltage tolerance and optimized low-leakage performance for precision applications; the "C" suffix indicates approximately ±5 % tolerance and intentional minor leakage rise for improved switching speed and noise reduction, as documented in AN90031. Both share identical SOT23 packaging and AEC-Q101 qualification.
Can this Zener diode replace a TL431 in a feedback loop?
No-BZX8450-B4V7-QR is a two-terminal passive Zener diode without internal amplification or adjustable reference capability. The TL431 is a three-terminal programmable shunt regulator with 2.5 V reference and op-amp functionality. This part serves only as a fixed-voltage shunt element and cannot replicate TL431's closed-loop regulation or gain characteristics.
BZX8450-B4V7-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450-Q
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.7 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 3 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-B4V7-QR FAQ
1.How can I place an order for BZX8450-B4V7-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B4V7-QR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BZX8450-B4V7-QR reliable?
The price and inventory of BZX8450-B4V7-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B4V7-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-B4V7-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B4V7-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B4V7-QR?
BZX8450-B4V7-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B4V7-QR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BZX8450-B4V7-QR?
For technical support, including BZX8450-B4V7-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B4V7-QR requirements.
6.How does Aetrix verify that BZX8450-B4V7-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-B4V7-QR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZX8450-B4V7-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-B4V7-QR?
All BZX8450-B4V7-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B4V7-QR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BZX8450-B4V7-QR part is unused and in its original packaging.
Return procedure for BZX8450-B4V7-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B4V7-QR Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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